nod nod nod 
long time ago i made this pieze of code to calculate a point in the space directly right in the player entity line of siege at an arbitrary float distance sooo later i can use that second vector3d point to raytrace 
whatever the player is looking at, the old one i have dont works anymore and theres many changes in the entities class  

scavenging on the arrow entity class i found an Vector3d vector3d = this.getDeltaMovement();  
but i need something based on the direction the entity is looking at a set distance 

 

is there some already made tool in minecraft code to do that ? 

 

 

 

old code i need to update 

	    // #########################################################################3
    public void calcularVectores(Entity player, int distancia, float precision) {
	        // float distancia = 5.0F;
        this.vectorInicio = new Vec3d(
                player.posX, 
                (player.posY + player.getEyeHeight()), 
                player.posZ
                );
	        // rotacion Vertical en grados
        this.gpitch = util.fixGrad(player.getPitchYaw().x); // pitch, nose up or down about an axis
        
        // rotacion Horizontal en grados
        this.gyaw = util.fixGrad( player.getPitchYaw().y); //yaw, nose left or right about an axis
        
        //100% = 0.0F grados de error 
        //0% = 45.0F grados de error en cualquier direccion
        if( precision < 99.9F) {
        float p = (((100F - precision) / 100F) * 45F);
        this.gpitch += (p * ((50F - util.rollsAd100dice()) / 100));
        this.gyaw += (p * ((50F - util.rollsAd100dice()) / 100));
        }
        
        //util.gradosAradianes(float x)
        //util.radianesAgrados(float x)
	        // rotacion Horizontal en radianes
        this.ryaw = util.gradosAradianes(this.gyaw);
	        // rotacion Vertical en radianes
        this.rpitch = util.gradosAradianes(this.gpitch );
        
        
        //correcccion de -90 grados
        double tmpryaw = this.ryaw - 1.5707964D;
	
        this.vectorObjetivo = new Vec3d(
                this.vectorInicio.x - ((Math.cos(tmpryaw)) * (Math.cos(this.rpitch) * distancia)) , 
                this.vectorInicio.y - (Math.sin(this.rpitch) * distancia), 
                this.vectorInicio.z - ((Math.sin(tmpryaw)) * (Math.cos(this.rpitch) * distancia))
                );
        
    }
	

 

 

 

 

 

I am not sure I understand, but you mentioned ray trace

Maybe you want entity.pick() which uses level.clip()?

e.g. Forge's debug overlay determining which block/fluid is being looked at.

https://github.com/MinecraftForge/MinecraftForge/blob/c2225ab1da58cf8eb3ac3aab1aab73f2d7a696fa/src/main/java/net/minecraftforge/client/gui/ForgeIngameGui.java#L895

more or less yes
getting the block the entity is looking at is one of the uses  but also helps to know if player is looking at an entity or agressive mob 

the code just return the second vector3d soo i could do raytrace